[librsvg: 13/19] Avoid cloning an owned value that is going to be dropped

[Federico Mena Quintero <federico src gnome org>]

commit 7bac028ec6ac0e93950a8188f75a6debd06b19bb
Author: Sven Neumann <sven svenfoo org>
Date:   Fri Aug 21 01:03:58 2020 +0200

    Avoid cloning an owned value that is going to be dropped
    
    See https://rust-lang.github.io/rust-clippy/master/index.html#redundant_clone

 rsvg_internals/src/document.rs    | 5 +----
 rsvg_internals/src/drawing_ctx.rs | 2 +-
 2 files changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/rsvg_internals/src/document.rs b/rsvg_internals/src/document.rs
index b57197c05..f504ef137 100644
--- a/rsvg_internals/src/document.rs
+++ b/rsvg_internals/src/document.rs
@@ -311,10 +311,7 @@ impl<'i> AcquiredNodes<'i> {
         if node.borrow_element().is_accessed_by_reference() {
             self.acquire_ref(&node)
         } else {
-            Ok(AcquiredNode {
-                stack: None,
-                node: node.clone(),
-            })
+            Ok(AcquiredNode { stack: None, node })
         }
     }
 
diff --git a/rsvg_internals/src/drawing_ctx.rs b/rsvg_internals/src/drawing_ctx.rs
index fa8201c9b..dd6b35d17 100644
--- a/rsvg_internals/src/drawing_ctx.rs
+++ b/rsvg_internals/src/drawing_ctx.rs
@@ -802,7 +802,7 @@ impl DrawingCtx {
         }
 
         // Non-existing filters must act as null filters (an empty surface is returned).
-        Ok(child_surface.clone())
+        Ok(child_surface)
     }
 
     fn set_color(